Okay, I see what you're saying about WhatsApp and Signal Lawrence.
I never before, but I just checked for a carrier update, and I was not prompted.
I usually restart my phone once or twice a day, just to keep it fresh from any buggy app or website that may get hung up and. is causing my phone to get brain fog.
Yes, when I open the Phone app I can enter and call any number. Some numbers ring, others don't. I can't detect a rhyme or reason. For those that don't ring, I can see that the time is going. Also, I can't turn on my speaker in either of these calls.
'Searching or No Service' never appeared. I saw that I always have service. I did take it to a carrier outlet, and the guy there tinkered with it for a while, then told me to take it to Apple Support.
Also, I visited a phone repair shop, and the guy there told me 7 & 7 plus have outstanding 'Audio IC' issues. I have no idea what that is.
I wanted to fix it myself, but I might have to take it to a Apple Support center and see if they can help.
I don't know if you have any idea what 'audio IC' issues are.
Thanks again for helping, I've learned a couple things about the phone.